Analysis of Photovoltaic System Energy Performance Evaluation Method

Research output: NRELTechnical Report


Documentation of the energy yield of a large photovoltaic (PV) system over a substantial period can be useful to measure a performance guarantee, as an assessment of the health of the system, for verification of a performance model to then be applied to a new system, or for a variety of other purposes. Although the measurement of this performance metric might appear to be straight forward, thereare a number of subtleties associated with variations in weather and imperfect data collection that complicate the determination and data analysis. A performance assessment is most valuable when it is completed with a very low uncertainty and when the subtleties are systematically addressed, yet currently no standard exists to guide this process. This report summarizes a draft methodology for anEnergy Performance Evaluation Method, the philosophy behind the draft method, and the lessons that were learned by implementing the method.
Original languageAmerican English
Number of pages64
StatePublished - 2013

NREL Publication Number

  • NREL/TP-5200-60628


  • energy
  • photovoltaic
  • test methods


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